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SECTION 32 - MOTOR MONITORING
BEARING TEMPERATURES
The motor bearing temperatures can be monitored with
either RTD's or thermistors. Both the shaft end bearings
and opposite shaft end bearings are monitored. There-
fore, 2 RTD's or thermistors are used. When RTD's are
used, they are connected to the Motor Monitoring Board
and the -001 board is required. When thermistors are
used, they are connected to the Variable Speed Drive.
The Bearing Temperature Protection setpoint must be
set to the sensor type that is used. Once set, the mi-
croboard, via serial communications, commands the
Motor Monitoring Board to read the appropriate sensor
inputs. If set to any setting other than DISABLED, the
respective temperatures are displayed on the MOTOR
DETAILS Screen. The settings are:
• DISABLED Disables the Bearing Temperature
feature. No bearing temperatures are displayed
and the heading, text and data boxes do not ap-
pear. The High Bearing Temperature Fault and
Warning will not occur. This setting is when if the
motor is not equipped with bearing temperature
sensors or if is desired to disable the feature for
service reasons. This is the default setting. The
Motor Monitoring Board is commanded to not
read any of its bearing temperature sensor inputs.
• RTD Enables and displays the 2 motor bearing
temperatures, as reported by the bearing RTD's,
via the Motor Monitoring Board serial commu-
nications. The microboard commands the Motor
Monitoring Board to read the sensor inputs at the
following points:
NOTES
Phase A RTD connection shown. Typical of all RTD inputs.
FIGURE 102 - WINDING AND BEARING TEMPERATURE – RTD
264
RTD ANALOG INPUTS
TB6
1
R
2
3
JCI COMPANY CONFIDENTIAL
TB5-7,8,9
Motor Bearing Opposite
Shaft End Temperature
TB5-10,11,12 Motor Bearing Shaft End
Temperature
• VSD THERMISTOR Enables and displays the
2 motor bearing temperatures, as reported by the
bearing thermistors via the VSD Logic Board
serial communications. The Motor Monitoring
Board is commanded to not read any of its bear-
ing temperature inputs.
The enabled bearing temperatures for the shaft end and
opposite shaft end bearings are displayed on the MO-
TOR DETAILS Screen. They are displayed over the
range of 32.0 399.5°F. If the Bearing Temperature Pro-
tection setpoint (on the MOTOR DETAILS Screen) is
set to DISABLED, no temperatures are displayed, and
the heading, text and data boxes do not appear. Any
RTD that registers as an open is considered invalid and
displays as XXX.X.
On the microboard, the bearing temperatures are com-
pared to warning and safety shutdown thresholds.
These thresholds are entered using the Bearing Setup
setpoint (on the MOTOR SETPOINTS Screen). The
HIGH BEARING TEMPERATURE SHUTDOWN
safety threshold is programmable over the range of
149 212°F (default 203). The HIGH BEARING TEM-
PERATURE WARNING threshold is programmable
over the range of 140 194°F (default 194). The values
programmed for these thresholds are displayed in the
respective data boxes on the MOTOR SETPOINTS
Screen.
FORM 160.54-M1
ISSUE DATE: 10/25/2019
LD15005
JOHNSON CONTROLS
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